The enzyme lactase is widely used in the dairy industry to convert the naturally occurring disaccharide sugar lactose into glucose and galactose. In this practical students investigate the treatment of milk with lactase. Following treatment they test the glucose content of the converted milk, and compare products...

A Catalyst article looking at the use of gas and electric for cooking. The article focuses on the latest hobs which use radiant, halogen or induction electric heating, to see if they can compete with gas.

This article is from Catalyst: GCSE Science Review 2004, Volume 14, Issue 3.

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Comets are considered to be time capsules containing information about the conditions of the early Solar System. In order to understand what comets are, where they come from, and their influence on the evolution of Earth, it is necessary to find out what material they contain. This teacher demonstration and student...

A Catalyst article about the work of a scientist from the British Antarctic Survey, gathering data about climate change by studying ice cores from Antarctica. One of the areas of research was to find out whether it is possible to learn how much sea ice there was around Antarctica in the past by measuring how much...

A Catalyst article explaining how scientists have found that the overturning circulation in the Atlantic Ocean, which maintains Europe’s moderate climate, was weaker in 2004 by 30% relative to earlier estimates. What does this mean and what impact could it have on our climate? Scientists' research and their climate...

In this project, students compare the properties of different kinds of climbing and safety rope.  They design tests to measure properties such as breaking strength and Young’s Modulus, and c...

This Catalyst article looks at how scientists can use material recovered from archaeological sites to see how crops have been introduced to different countries over the history of farming. Three processes by which some plant material can be preserved are explained. The ratio of carbon isotopes from the collagen in...

This is one of the 14 Background Books published for Stage III of the Nuffield Chemistry Sample Scheme. The books were highly illustrated and designed to be attractive. This book describes applications of chemistry to solve practical problems.

There are three parts to this book:
*Part 1: What is...

This Nuffield Working with Science unit was intended to help students to appreciate the purposes of different types of cosmetics, to distinguish between purely decorative and 'useful' preparations, to understand the reasons for the formulations of different types of...

Produced by the Science and Technology Facilities Council (STFC), Cosmic Rays is a colour A5 leaflet that opens out into an A2 double-sided wallchart describing cosmic rays and where they come from, what effect they have on Earth and how they are used in scientific applications. Sections of the leaflet cover: *The...

Produced by the Royal Observatory Greenwich, this booklet covers the Doppler effect in the context of cosmological redshift. Included is an online video that discusses the size of the Universe. Equations and physical terms are introduced and discussed. Questions and answers are included that test a student’s...

This book on cosmology, from the Royal Astronomical Society, provides a good primer for those teaching A-level physics courses or GCSE Astronomy.

The resource begins by introducing the history of measurements in...

This resource, from the Microbiology Society, gives an overview of role of the immune system and how it is affected by training intensity. Exercise can have both a positive and negative effect on immune function and can influence an individual’s vulnerability to...